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Cisco 300 Series

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DNS Settings

Use the DNS Settings page to enable the DNS feature, configure the DNS servers and set the default domain used by the device.

  1. Click IP Configuration > Domain Name > DNS Settings.
  2. Enter the parameters.
    • DNS—Select to designate the device as a DNS client, which can resolve DNS names into IP addresses through one or more configured DNS servers.
    • Polling Retries—Enter the number of times to send a DNS query to a DNS server until the device decides that the DNS server does not exist.
    • Polling Timeout—Enter the number of seconds that the device will wait for a response to a DNS query.
    • Polling Interval—Enter how often (in seconds) the device sends DNS query packets after the number of retries has been exhausted.
      • Use Default—Select to use the default value.

        • This value = 2*(Polling Retries + 1)* Polling Timeout

      • User Defined—Select to enter a user-defined value.
    • Default Parameters—Enter the following default parameters:
      • Default Domain Name—Enter the DNS domain name used to complete unqualified host names. The device appends this to all non-fully qualified domain names (NFQDNs) turning them into FQDNs.

        • NOTE     Do not include the initial period that separates an unqualified name from the domain name (like cisco.com).

      • DHCP Domain Search List—Click Details to view the list of DNS servers configured on the device.
  3. Click Apply. The Running Configuration file is updated.

    4. DNS Server Table: The following fields are displayed for each DNS server configured:

    • DNS Server—The IP address of the DNS server.
    • Preference—Each server has a preference value, a lower value means a higher chance of being used.
    • Source—Source of the server's IP address (static or DHCPv4 or DHCPv6)
    • Interface—Interface of the server's IP address.
  4. Up to eight DNS servers can be defined. To add a DNS server, click Add.

    5. Enter the parameters.

    • IP Version—Select Version 6 for IPv6 or Version 4 for IPv4.
    • IPv6 Address Type—Select the IPv6 address type (if IPv6 is used). The options are:
      • Link Local—The IPv6 address uniquely identifies hosts on a single network link. A link local address has a prefix of FE80, is not routable, and can be used for communication only on the local network. Only one link local address is supported. If a link local address exists on the interface, this entry replaces the address in the configuration.
      • Global—The IPv6 address is a global Unicast IPV6 type that is visible and reachable from other networks.
    • Link Local Interface—If the IPv6 address type is Link Local, select the interface through which it is received.
    • DNS Server IP Address—Enter the DNS server IP address.
    • DNS Server State—Select to activate the new DNS server.
  5. Click Apply. The DNS server is saved to the Running Configuration file.